Section-by-Section Immutability Rules

Messages

Editable: Draft messages before sending Permanent: Everything after clicking Send What's Locked: Text, attachments, timestamp, read receipts What Can Change: Nothing

Expenses

Editable: Draft expenses before submitting Permanent: Amount, date, category, receipts after Submit What's Locked: All financial details, approval status What Can Change: Disputes add notes but don't change original

Calendar

Editable: Events while being created Permanent: History of all events What's Locked: Original event details What Can Change: Events can be modified, but changes are logged

Timeline

Editable: Never — entries save immediately Permanent: All entries from moment of creation What's Locked: Title, description, date, category What Can Change: You can add follow-up entries referencing originals

Documents

Editable: File names, organization Permanent: File contents once uploaded What's Locked: Document content, upload date What Can Change: Metadata, folder location